You seem to be forgetting something very important -- Near was an immature retard. Just as a child can't understand why nations go to war, Near, unlike L, could never comprehend something as "complex" as "if you all the bad people, crime will go down". This isn't the same as capital punishment where people are killed by the government after a trial. These people are killed by a god (Light may be human, but the entity Kira is not...something else Near could never understand) and not always after a trial. While lacking in justice, it is fair. I'm sure Light accidentally killed people he shouldn't have, but he was fair about it (he didn't play favorites). So not only were more criminals dying (which actually inhibited the ability for the "bad guys" to do bad things) it also would have produced a "God's Judgment" feeling. Nothing says "control" like "divine will".
These things are too abstract and complex for Near. Now, if Light instead said "here kid, I'll give you a sucker if you just hurry up and die" he may have won, but "dude, look, the world is a better place because of me already and it'lll only get better" is pointless. And for those doubters, they even say at the beginning of the second season that Light's plan was effective so there was little room for 'tard boy to argue.
Also, @Auzrian, Griffith was far from being the greatest bastard of all. Recall, assuming you have watched/read death note, that Light scarified his own father while lying to him (strait-faced no less) and killed his supporters. Also, Grifith had an extremely shitty life. From the anime he had tongue cut out so he couldn't speak, his tends in his wrists cut so he could never fight, and his tendons in his legs slashed so he couldn't stand no less walk or run. Half starved and probably throughly raped, his life was hell. Given the circumstances, I bet most people would have ended up in a similarly twisted state. Certainly they would hate Gutsu. What was lights plight? He was bored? He was a strait A pretty boy would could have had anything he wanted. He was loved and respected up until the final episode.
Light is still the greater Bastard. He also is one of the greatest anime characters ever (meaning top 25). Griffith is pretty cool and he is a bastard, but he isn't even in the top 10 bastards, or top 100 greatest. Suitengu would make for a good #2 if his life didn't suck as bad as it did (of all the "villains" he has had the hardest life in my opinion as he was abused emotionally, physically, and mentally to an extreme degree then life shat on him).
[edit] Suitengu is from Speed Grapher by the way. Like Light, he was actual a good guy, however, he has a long list of offenses.:
1) murder
2) abuse of power (I find this to be a serious transgression)
3) he gave a little girl hormones to prevent her from entering puberty so he could brain wash her into working a fetish club
4) Like Griffith (after his "ascension") and Light (he was born a bastard) Suitengu was guiltless in his acts, but unlike Light, he was at one time a normal kid. Griffith was always a bit of a dick.